Nonce services that only validates the timestamp of a consumer request. The nonce
is not checked for replay attacks.

The timestamp is interpreted as the number of seconds from January 1, 1970 00:00:00 GMT. If the timestamp
is older than the configured validity window, the nonce is not valid. The default validity window is
12 hours.

Validate a nonce for a specific consumer timestamp. This is an opportunity to prevent replay attacks. Every nonce
should be unique for each consumer timestamp. In other words, this method should throw a BadCredentialsException
if the specified nonce was used by the consumer more than once with the specified timestamp.